<template>
  <div class="channel-edit">
    <van-cell :border="false">
      <div slot="title" class="title-text">我的频道</div>
      <van-button class="edit-btn"
        size="mini" round 
        type="danger" plain
        >编辑
      </van-button>
    </van-cell>
    <van-grid class="my-grid" :gutter="10">
      <van-grid-item
         icon="clear"
         class="grid-item"
         v-for="(channel, index) in myChannels"
         :key="index"
       >
         <span class="text" 
            :class="{ active: index === activeIndex }" 
            slot="text">{{ channel.name }}
         </span>
      </van-grid-item>
    </van-grid>
    <van-cell :border="false">
      <div slot="title" class="title-text">频道推荐</div>
    </van-cell>
    <van-grid class="recomment-grid" :gutter="10">
      <van-grid-item
          icon="plus"
          class="grid-item" 
          v-for="channel in recommendChannele" 
          :key="channel.id" 
          :text="channel.name"
          @click="onAddChannel(channel)"
      />
    </van-grid>
  </div>
</template>

<script>
import { getAllChannels } from '@/api/channel.js'
import { mapState } from 'vuex'
export default {
  name: 'ChannelEdit',
  props: {
       myChannels: {
         type: Array,
         required: true
       },
       activeIndex: {
         type: Number,
         required: true
       }
     },
     data(){
      return{
        allChannels: [] // 所有频道
      }
     },
     computed:{
      ...mapState(['user']),
      recommendChannele(){
        return this.allChannels.filter(channel=>{
          return !this.myChannels.find(myChannel =>{
            return myChannel.id===channel.id
          })
        })
      }
     },
     created(){
      this.loadAllChannels()
     },
     methods:{
      async loadAllChannels(){
        try{
          const { data } = await getAllChannels()
          this.allChannels = data.data.channels
        }catch(err){
          this.$toast('数据获取失败')
        }
      },
      onAddChannel (channel) {
        this.myChannels.push(channel)
      }
     }
    }
</script>

<style scoped lang="less">
.channel-edit {
  padding: 85px 0;

  .title-text {
    font-size: 32px;
    color: #333;
  }

  .edit-btn {
    width: 104px;
    height: 48px;
    font-size: 26px;
    color: #f85959;
    border: 1px solid #f85959;
  }

  /deep/ .grid-item {
    width: 160px;
    height: 86px;
    .van-grid-item__content {
      white-space: nowrap;
      background-color: #f4f5f6;

      .van-grid-item__text,.text {
        font-size: 22px;
        color: #222;
        margin-top: 4px !important;
      }
      .active {
        color: red;
      }
    }
  }

  /deep/ .my-grid {
    .grid-item {
      .van-icon-clear {
        position: absolute;
        right: -10px;
        top: -10px;
        font-size: 30px;
        color: #cacaca;
        z-index: 2;
      }
    }
  }

  /deep/ .recomment-grid {
    .grid-item {
      width: 160px;
      height: 86px;
      .van-grid-item__content {
        flex-direction: row;

        .van-icon-plus {
          font-size: 22px;
          line-height: 22px;
          margin-right: 6px;
        }
      }
    }
  }
}
</style>